Year	Number
2012	1.7387528466875386
2013	2.3150756886390327
2014	6.409142756682357
2015	20.597781447991235
2016	35.914858859784644
2017	24.062197696735524
2018	22.586136305251888
2019	2.310438838424481
2020	7.051593239154675